998001

Appears in sequences

• Numbers whose square is expressible as the difference of positive cubes in more than one way.at n=9A051393
• a(n) = (10^n - 1)^2.at n=3A059988
• Largest n-digit square.at n=5A061433
• Largest n-digit perfect power.at n=5A069659
• Squares arising as a concatenation of k and 9's complement of k.at n=7A084006
• Numbers n that can be chopped into two parts, which when added and squared result in n.at n=9A102766
• Numbers which when chopped into one, two or more parts, added and squared result in the same number.at n=28A104113
• Numbers whose square is the concatenation of two numbers k and k-4.at n=5A115443
• Numbers which can be expressed as the product of numbers made of only nines.at n=28A161147
• Numbers which when chopped into two parts with equal length, added and squared result in the same number.at n=5A238237
• Perfect squares k such that each decimal digit of k is equal to the difference of at least two other digits of k.at n=15A255893
• Numbers k such that k+1 concatenated with k is a square.at n=4A328089
• Rotationally ambigrammatic square numbers with no trailing zeros.at n=36A340164
• Numbers k that divide the smallest number whose sum of digits is k.at n=39A342810
• Numbers k = x.y which when split into two parts x and y of equal length, added and squared result in the same number k, '.' means concatenation, and the second part y starts with 0.at n=1A350918